Hi there,
In urinary tract
infection backache is very common. Bladder
infection, pyelonephritis are other causes
of lower back ache. You may take a muscle relaxant for pain relief. An ultrasound scan may be helpful in detecting if there is any kidney stone or anatomic /structural problem with the kidneys. Other causes of backache are injury or overuse of muscles, ligaments, and joints. It is suggested to get evaluated by your attending doctor.